package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServicempl implements ShoppingCartService {

    @Autowired
    ShoppingCartMapper shoppingCartMapper;

    @Autowired
    DishMapper dishMapper;

    @Autowired
    SetmealMapper setmealMapper;

    /**
     * 添加购物车商品
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //先判断是否存在某商品
        if (list != null && list.size() > 0) {
            //已存在(数量加一)
            ShoppingCart Cart = list.get(0);
            Cart.setNumber(Cart.getNumber()+1);
            shoppingCartMapper.updateNuberById(Cart);//更改
        }else {
            //不存在就添加
            //判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){
                //添加的是菜品
                Dish dishId1 = dishMapper.getDishId(dishId);
                shoppingCart.setName(dishId1.getName());
                shoppingCart.setImage(dishId1.getImage());
                shoppingCart.setAmount(dishId1.getPrice());
            }else {
                //添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal byId = setmealMapper.getById(setmealId);
                shoppingCart.setName(byId.getName());
                shoppingCart.setImage(byId.getImage());
                shoppingCart.setAmount(byId.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {

        Long userId = BaseContext.getCurrentId();
        ShoppingCart build = ShoppingCart.builder()
                .userId(userId)
                .build();
        return shoppingCartMapper.list(build);
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.delete(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNuberById(shoppingCart);
            }
        }
    }
}
